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Animating a line with an arrow in d3
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| <!doctype html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8" /> | |
| <title>Animating a line with an arrow in d3</title> | |
| <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
| <style> | |
| .line { | |
| stroke: blue; | |
| stroke-width: 1.5px; | |
| fill: white; | |
| } | |
| circle { | |
| fill: red; | |
| } | |
| #marker { | |
| stroke: black; | |
| fill: black; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="chart"> | |
| <script language="javascript"> | |
| "use strict" | |
| var svg = d3.select("body").append("svg").append("g").attr("transform", "translate(100,50)") | |
| svg.append("svg:defs") | |
| .append("svg:marker") | |
| .attr("id", "arrow") | |
| .attr("refX", 2) | |
| .attr("refY", 6) | |
| .attr("markerWidth", 13) | |
| .attr("markerHeight", 13) | |
| .attr("orient", "auto") | |
| .append("svg:path") | |
| .attr("d", "M2,2 L2,11 L10,6 L2,2"); | |
| var line = d3.svg.line() | |
| .x( function(point) { return point.lx; }) | |
| .y( function(point) { return point.ly; }); | |
| function lineData(d){ | |
| // i'm assuming here that supplied datum | |
| // is a link between 'source' and 'target' | |
| var points = [ | |
| {lx: d.source.x, ly: d.source.y}, | |
| {lx: d.target.x, ly: d.target.y} | |
| ]; | |
| return line(points); | |
| } | |
| var path = svg.append("path") | |
| .data([{source: {x : 0, y : 0}, target: {x : 80, y : 80}}]) | |
| .attr("class", "line") | |
| //.style("marker-end", "url(#arrow)") | |
| .attr("d", lineData); | |
| //var arrow = svg.append("svg:path") | |
| //.attr("d", "M2,2 L2,11 L10,6 L2,2"); | |
| console.log(d3.svg.symbol()) | |
| var arrow = svg.append("svg:path") | |
| .attr("d", d3.svg.symbol().type("triangle-down")(10,1)); | |
| arrow.transition() | |
| .duration(2000) | |
| .ease("linear") | |
| .attrTween("transform", translateAlong(path.node())) | |
| //.each("end", transition); | |
| // Returns an attrTween for translating along the specified path element. | |
| function translateAlong(path) { | |
| var l = path.getTotalLength(); | |
| var ps = path.getPointAtLength(0); | |
| var pe = path.getPointAtLength(l); | |
| var angl = Math.atan2(pe.y - ps.y, pe.x - ps.x) * (180 / Math.PI) - 90; | |
| var rot_tran = "rotate(" + angl + ")"; | |
| return function(d, i, a) { | |
| console.log(d); | |
| return function(t) { | |
| var p = path.getPointAtLength(t * l); | |
| return "translate(" + p.x + "," + p.y + ") " + rot_tran; | |
| }; | |
| }; | |
| } | |
| var totalLength = path.node().getTotalLength(); | |
| path | |
| .attr("stroke-dasharray", totalLength + " " + totalLength) | |
| .attr("stroke-dashoffset", totalLength) | |
| .transition() | |
| .duration(2000) | |
| .ease("linear") | |
| .attr("stroke-dashoffset", 0); | |
| </script> | |
| </body> | |
| </html> |
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